What part of speech is long playing the part of in the bold parts of the quotations below?

For one thing, it shows at a glance how much money is on hand for any particular purpose all month long.

The fishermen stayed in their nets the whole night long.

Some people prefer to live in places that have the same weather or climate all year long.

He had told them to sit on the edge of the sandbox all recess long and not move a finger.

Wild animals, driven by hunger, came all winter long to live close to the feeding station.

Other friends worked hard all semester long and didn't feel any pressure at all as the final exam approached.

One half of the labor actually expended in the cultivation of these grapes would have kept them in tip-top order the whole season long if they had been planted in four rows as already suggested rather than in twenty short ones.

It suddenly came to him that he would never, his whole life long, see Gramps again.

He did such good work, and so much, that nobody would question him. Plus he could go all shift long, and most of them couldn't.

She realized suddenly how old and hurt he was, an elder with gray hair and loose skin, and yet he had been working with his paddle nearly the whole day long.

All year long, all decade long, all century long, the sun just keeps on shining.

To me it looks like it’s acting as some sort of “adverbial postposition of time”, just as during is an adverbial preposition of time in phrases like during the night.

The problem is that long follows its NP complement, just as ago does in three years ago, making it more of a postposition like ago than a preposition like during. I think.

How should this sort of construction best be classified? The OED calls long an adverb here.

Edit

My confusion may be that I’m unclear about the transition from something being a modifier that takes a complement and it becoming an actual preposition/postposition/adposition.

I am not referring to long used as an adverb in such collocations as “How long have you been here?” or “as long as you like”. Rather, I mean what the OED gives as its sense 6 of long1adv. the following:

6. Subjoined to expressions designating a period of time, with the sense: Throughout the length of (the period specified). [Compare German sein leben lang.]

It’s been used this way at least since Middle English; the first citation given is for “all year long” from back around 1290 ᴀᴅ in the South English Legendary (a source that provides 2359 quotations):

This is not one of the entries that has yet been updated for the OED3, so perhaps the analysis has changed since the OED2. However, it is similar to the entry for agoadj. and adv, which has indeed been updated for the OED3, and which remains an adverb when used in phrases like “long ago” and “longer ago”, but which it classifies as an adjective when used in the more customary collocation of time, as with this recent citation:

There appears to be some dispute about whether things like ago constitute actual instances of “postpositions” in English, or whether they are better left in their traditional categories of adjectival or adverbial modifiers that just happen to follow their modificand.

If the first is to be called a preposition, but the second is not to be called a postposition, then we have to call through an adjective “modifying” night and the entire thing somehow a noun phrase being used adverbially. That seems to be the very sort of classificational contortion as is being attempted with calling long an adjective, and I find both to be particularly unsatisfying approaches.

SUMMARY

A clearer explanation of what long is and is not in the type of collocations presented in the initial example list would be much appreciated. It’s ok if multiple models of analysis are presented.

PS: I do not have personal access to the recent work by Dennis Kurzon about adpositions in:

How long? Two hours long. Three days long. A few weeks long. Some years long. His whole life long. Looks to me like everything else modifies long, whether it's deployed as an adverb or as an adjective.
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StoneyBApr 17 '13 at 2:00

@StoneyB So do you consider “three days ago” as having “three days” modifying “ago”, too?
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tchristApr 17 '13 at 2:03

1

But you can't ask How ago? I don't recall ever hearing of a six-month-ago conference. You can't nominalize to an agoth [or would it be 'an agait'?] of three days. You don't say He worked so ago.
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StoneyBApr 17 '13 at 2:13

And how bout this: three days ago ... long, long ago. I don't know exactly how to characterize this; but I'm pretty sure long doesn't work like ago or since or during.
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StoneyBApr 17 '13 at 2:44

Long seems similar to old as in 3 years old.
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Ilya KoganApr 17 '13 at 3:05

6 Answers
6

The Old English word lang has suffix forms -ling and -long, (“with the direction, duration, or length”), similar to -lic (“with the body or form”) that survives as the very common -ly adverbial suffix form.

The -ling form, once used in words like hinderling (“in the backward direction”) has been supplanted by another usage, the nominal diminutive: darling, yearling. The -long form still survives, with all three senses, in words like headlong, nightlong, and footlong.

The suffix is adverbial in directional modifiers like headlong and arselong, adjectival in metric modifiers like footlong and nightlong. When combined with a quantifier to form an adjectival or adverbial phrase, the metrics compounds break into their component words:

I ate a footlong sandwich. [adjective]

This sandwich is one foot long. [adjectival phrase]

This sandwich measures one foot long. [adverbial phrase]

We attended a nightlong party. [adjective]

We stayed at the party the whole night long. [adverbial phrase]

As these express spatial and temporal dimension rather than relationship, it's not clear whether these are adpositions or simply adjectives with an idiomatic phrase order. However, the close similarity to a hole one foot through or party the whole night through suggests that they may indeed be postpositions.

I considered but rejected that, because it produces an invalid parse using any valid production that I can imagine. To illustrate: In the phrase, "I worked all night long", if both all and long are adjectives that somehow modify the noun night, then what in the world type sentence is this? It then becomes N-V-NP, but it cannot be SVO, since the presumed NP "all night long" is not the object of work.
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tchristApr 17 '13 at 16:28

I believe that your parse is incorrect. "All night" is the <time-duration> in the construct; separating "all" from "night" is like separating "five" from "minutes" in the phrase "five minutes long."
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GnawmeApr 17 '13 at 16:52

If I work all day, is day a noun or an adverb?
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tchristApr 17 '13 at 16:58

Dictionaries tend to identify "all day long" and its brethren as phrases; however, you seem to be dissatisfied with simply tossing them off as adverbial phrases. This grammarian shares your dissatisfaction, and I refer you to him.
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GnawmeApr 17 '13 at 17:42

I will probably be able to content myself with some sort of adverbial phrase, whether with or without an adposition.
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tchristApr 17 '13 at 18:17

the verb is acting upon the subject/object without a pause/fail. It goes on, regardless of any other happening.

since the verb is acting all through the situation of time/any other parameter, it is only the verb in its sense/league to be acting upon the subject/object.

Taking the example above,

The fishermen stayed in their nets the whole night long.

In the example above,

the fishermen stayed in the nets throughout the night. They did not get away doing so. None of them got off through it for even a single second.
the long describes that staying was the only thing in the league that the fishermen could do while they were at the place they were.

since the fishermen stayed in the nets throughout the night, it is the only place where they stayed then. Therefore proving the second point.